Aim MyChron 3 Plus/Gold CAR Guide

MyChron 3 Plus/Gold CAR – Version 1.01 1
TECHNICAL DOCUMENTATION 04/06/2004 GAUGE
Notes: MyChron 3 Plus/Gold CAR technical documentation, dimensions and pinout –
Version 1.01
MyChron 3 Plus/Gold
CAR
Figure 1: MyChron 3 Plus/Gold Car
Introduction
MyChron 3 Plus/Gold CAR represents the new generation of Aim data acquisition systems that
provides the driver with a wide, easy to use and multifunctional display.
MyChron 3 Plus/Gold CAR monitors and displays RPM, 4 analog inputs (temperatures or
pressures for Plus version, temperature, pressures, potentiometers and Lambda sond for Gold
version), speed, current gear number and lap (split) times. It has a backlight, which can be
switched on during night racing.
The logger records the following parameters:
•4 analog inputs;
•engine’s RPM;
•lap and split times;
•engaged gear number;
•1 speed input;
•lateral acceleration (MyChron 3 Gold only);
•logger battery voltage;
•logger temperature;
Data is stored in a huge internal flash memory (512 kbyte for Plus version and 8 Mbyte for Gold
one) and is downloaded to a PC through an USB cable.
For further information concerning the gauge’s display, refer to the following drawing.
Displayed channels
2nd displayed channel
1st displayed channel
Low battery warning
Night vision
RPM digital value
Speed
Best lap time
Battery voltage
4 alarm led:
from "AL 1" to "AL 4"
Lap / Split times
USB port
Gear display
10 fully configurable shift lights
RPM graphical bar
Configurable RPM scaling
Speed unit of measure
Temperature unit of measure
Figure 2: MyChron 3 Plus/Gold Car display unit

MyChron 3 Plus/Gold CAR – Version 1.01 2
Installation notes
•We recommend to choose a place where the instrument will not be in contact with oil or
fuel, be sure that the gauge is not installed too close to heat sources and protect the
instrument from vibrations;
•To correctly measure the lateral g-force through the internal accelerometer (MyChron 3
Gold only), we suggest to install the gauge with the display perpendicular to the vehicle’s
speed;
•Please remember that your MyChron 3 Plus/Gold is not equipped with internal batteries,
and so it needs to be powered by an external 9 – 15V power source (i.e. the car battery).
Do not exceed these limits.
•When the gauge has been correctly installed, plug the input cable inside the MS female
connector on the gauge’s back-side.
•After this, please connect the sensors in the input cable.
How to connect MyChron 3 Plus/Gold CAR to the PC
To connect your MyChron 3 Plus/Gold CAR to the PC, please use the USB data download cable
and plug it both in the gauge’s USB port and in the PC’s USB port, as explained in the following
figure. Moreover, we remind You to use a 9-15 Volts external power source to switch on the
gauge.
Figure 3: How to connect MyChron 3 Plus Gold Car to the Pc
Software
9 – 15 V
When the data logger has been installed and the sensors plugged in it, to acquire consistent and
correct information, the data logger has to be configured. For a correct configuration, please use
Race Studio 2, the software properly developed by Aim to configure its instruments and analyze
stored data.
In Race Studio 2 main window, shown here on the right,
You can choose your data logger.
Please, select “MyChron 3 Plus/Gold” and, then, press
“System manager” button
Now, please follow these configuration steps:
1. Set the desired input channels;
2. Configure the input channels;
3. Transmit the configuration to the logger;
4. Calibrate/autocalibrate the sensors;
5. Transmit the configuration to the logger.

MyChron 3 Plus/Gold CAR – Version 1.01 3
1) How to set the input channels
Press “Channels” button to set the sensors you have installed
on your gauge. The following screenshot appears.
To set an input channel, double-click on the cell that
corresponds to the desired one: the screenshot shown in the
previous picture appears.
Select the desired input channel among the available ones.
2) How to configure the gauge
When the desired input channels have been set, press button
“Configuration” button to set RPM maximum value,
temperature measure unit, RPM factor, split numbers etc…
The following screenshot appears.
To correctly configure your MyChron 3 Plus/Gold CAR it
is necessary to set all parameters reported in this dialog box:
•Display language.
•RPM multiply factor.
•Maximum RPM value.
•Temperature, pressure and speed measure unit.
•The alarm values for the 4 analog inputs.
•Pulses per wheel revolution.
•Wheel circumference.
•Obscuring time.
•Number of splits.
•Shift lights.
•Gear sensor (None, “On-board”, Calculated).
Please, refer to the user’s manual in order to get further
information concerning gauge’s configuration.
3) How to transmit the configuration
When You have set input channels and configured them, you
have to transmit the configuration to the instrument pressing
“Transmit” button.
We remind You that, to transmit the configuration, the gauge
must be switched on and connected to the PC.
4) How to calibrate/auto calibrate the sensors
Once the configuration has been transmitted to the PC you
have to calibrate/auto calibrate the sensors.
The internal lateral accelerometer and the “potentiometer
distance” need to be auto calibrated, while “Mid zero
potentiometer”, “zero based potentiometer” and “on-board
gear sensor” need to be calibrated.
Please press “calibrate” button and the following screenshot
appears.
Please follow these instructions:
•The G-force sensor and the “potentiometer distance”
sensor need to be auto calibrated; to do so, please
press button “Click here to autocalibrate all sensors
in the list”.
•To calibrate “on-board” gear sensor, “Mid zero
potentiometer” or “zero based potentiometer”,
please click on the corresponding “Calibrate” button
and follow the instructions prompted on your PC’s
monitor.
We remind You that the calibration/auto calibration
procedure is fundamental to acquire correct data.
5) Re-transmit the configuration
Once the calibration/auto calibration has finished, it is
absolutely necessary to re-transmit the configuration to your
MyChron 3 Plus/Gold CAR pressing “Transmit” button.

MyChron 3 Plus/Gold CAR – Version 1.01 4
Dimensions
48 [1,89]
87 [3,43]
126 [4,96]
Dimensions in millimetres [inches]
Connector details (Channels inputs)
Pin Function Pin Function
A +Channel 1 P GND
B -Channel 1 (GND) R + VB
C +Channel 2 S Speed
D -Channel 2 (GND) T GND
E +Channel 3 U + VB
F -Channel 3 (GND) V Gyroscope
G V ref1 W Magnetic lap
H +Channel 4 X + VB
J -Channel 4 (GND) Y RPM 150-400 V
(coil input)
K V ref2 Z RPM 8-50 V (square
wave input)
L + Gear a GND
M - Gear (GND) b + V battery (input)
N Optic lap c GND
Connector details (Keyboard remoting)
Pin Function Pin Function
1 View 4 Menu
2 Mem 5 GND
3 Conf
Connector details (USB)
Pin Function Pin Function
1 USB D+ 3 V battery
2 GND 4 USB D-
1
4
32
51
42
3
Female Binder connectors pinout (external view): 5 pins
(left) and 4 pins (right)
JK
Z
U
V
E
D
X
WcY
ba
M
L
N
B
F
GH
P
R
TS
A
C
Female MS connector pinout (external view): 26 pins
Specifications
General characteristics Value
Input channels (Plus) 7
Input channels (Gold) 9
Internal memory (Plus) 512 kbyte flash EPROM
Internal memory (Gold) 8 Mbyte flash EPROM
PC interface 300 kbyte/sec USB port
Sampling frequency Up to 200 Hz per channel
Max sampling frequency 500 Hz
Internal g-sensor (Gold) ±10g
External power From 9 to 15 VDC
Voltage output (V reference) 4.5 V (for potentiometers)
Other characteristics Value
MyChron 3 PG dimensions 126x92x24 mm
Display dimensions 87x48 mm
Environmental IP 65